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DAVE WILLIAMSON
Heres another tricky one, what happens to the IP rating on a new mk mains unit that you have just installed,and the knockout you have just opened is too big for the cable you are putting in,and a small gap is now left open,only small but there it is,is it ok to mastic the hole,or does the IP rating alter. Just a thought as you see loads of mains units with small entry holes next to the cables going in...